How to best smoke test that redoc renders correctly?

I have previously published updates that broke Redoc rendering (for example, due to an invalid schema reference). This gives the "an error occurred" screen with red text and a stack trace.

I'm therefore after a stable, simple check that verifies that Redoc manages to render anything at all. This would allow me to include smoke tests that verify that this does not happen. How can I best do this?

For example, I could check for the existence of an element with the redoc-wrap or api-content classes, but this may create brittle tests: I have no guarantee that these won't change in the future and therefore break my smoke tests even though it renders correctly.

No file or test path is named. Start by reviewing Redoc's rendering smoke-test setup and the DOM around the redoc-wrap and api-content classes, comparing successful rendering with the "an error occurred" screen. Done means a stable check distinguishes rendered content from the error state without relying on brittle implementation classes.